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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '19c992dc50f565ffce716f134c2d70a2dc9b322b8d570758040964111dae8d86' 
  AND token = 'zmw4FSnTVmTrQD29gApfI2MEql8Tuey78+eoq7SEqTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}